Transient behavior of viscoelastic fluid in an extruder
Article first published online: 9 MAR 2003
Copyright © 1968 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 12, Issue 1, pages 115–122, January 1968
How to Cite
Chan, R. K. S., Lee, C. W. M. and Biggs, R. D. (1968), Transient behavior of viscoelastic fluid in an extruder. J. Appl. Polym. Sci., 12: 115–122. doi: 10.1002/app.1968.070120110
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Received: 15 MAY 1967
A simplified model is used for calculating the time-dependent velocity of polymeric fluid in an extruder. The flow properties of the fluid are characterized by a simple constitutive equation based on two parameters: a constant viscosity μ and a constant elasticity modulus G. It was found that the transient velocity fluctuates periodically, and the time tt needed to restore the steady-state velocity from a disturbance varies with the ratio G/μ and the dimensionless group ρH2G/μ2, where ρ is the density of the fluid and H is the screw depth of the extruder.